Hey guys sorry for the mega necro resurrection, but I built this today using the pcb v1.2 posted earlier in the thread.

Something is very wrong... it does pass a signal but it's very trebly (I already switched out c10 to pre-compensate but to no avail) and I can hear odd glitches. The rate is all bunched up at one end (almost to a stutter speed) and basically it's unusable.

FWIW, I purchased a xr2206 chip from a USA seller on eBay (for way too much money). It could very well be just coincidental, but this circuit sounds waaaaaaay better with the pricey xr2206 chip when compared with the three I purchased from tayda.